Ostasio I da Polenta

Ostasio I da Polenta (1289-14 November 1346) was the Prince-Bishop of the city of Ravenna in northern Italy under the Papal States from 1322 to 1346, succeeding Guido II da Polenta and preceding Bernardino I da Polenta.

Biography
Ostasio was born in 1289, the son of Bernardino da Polenta, lord of Cervia in Italy. On 20 September 1322, Ostasio took advantage of Guido II da Polenta's absence to seize Ravenna, killing archbishop Rinaldo da Polenta and making Ravenna his own domain. Four years later, he had his uncle Bannino da Polenta killed to conquer Cervia, and Ostasio was a patron of the arts; he gave Giovanni Boccaccio a house at his court. Pope Benedict XII appointed him a papal vicar, but he died on 14 November 1346 when his son Bernardino I da Polenta killed him and seized power for himself.